Dometic 301
Water-valve service part picturedLow-profile polypropylene-bowl toilet with a round seat. Use the 301 parts breakdown to identify the correct seat, seal, water valve and floor hardware.
Dometic 301, 311 & 321 Low-Profile Toilet Parts and Fit Guide
The Dometic 301, 311 and 321 are low-profile, foot-pedal gravity-flush RV toilets. They are designed for shorter installation spaces, but their bowl material, seat shape, front-to-back dimensions and floor-flange clearances differ. Find the model label on the toilet base beneath the water valve, then use the correct numbered parts guide below.
Identify your low-profile toilet
These photographs show two complete toilet models and, for the 301, a clearly labelled water-valve replacement component. They are provided to help locate the correct service guide; match the original model label and finish before buying a complete toilet or seat.
Water-valve service part picturedDometic 311
Round ceramic-bowl model picturedLow-profile ceramic bowl with a round-seat layout. Plastic and wood-seat arrangements have different seat hardware; identify the installed assembly before ordering.
Dometic 321
Elongated ceramic-bowl model picturedLow-profile elongated ceramic bowl with enameled-wood factory seat style. Compare the wider room needed at the front of the toilet and the existing seat hinges.
Dometic 301 vs 311 vs 321 — factory measurements
Measurements are taken from Dometic's installation manual. The rough-in is the minimum distance from the centre of the floor flange to the back wall. Check pedal movement, door clearance and the water connection too.
| Specification | 301 | 311 | 321 |
|---|---|---|---|
| Bowl material | Polypropylene | Ceramic | Ceramic |
| Factory seat style | Polypropylene, round | Polypropylene, round | Enameled wood, elongated |
| Overall height | 15½ in | 15¼ in | 15 in |
| Seat height | 14 in | 13¾ in | 13½ in |
| Width | 16 in | 15 in | 14¾ in |
| Front-to-back depth | 19¾ in | 19 in | 22 in |
| Minimum wall-to-flange rough-in | 8¾ in | 10 in | 11 in |
| Height with seat lid raised | 30 in | 29½ in | 31 in |
Common repair components by photo
Below are pictured Dometic parts found in these gravity-flush toilet service families. A matching product name does not guarantee every production version uses the same component; use the 301, 311 or 321 numbered drawing to check its exact part number.
Fresh-water valve385311641Controls the fresh-water inlet when the pedal is used.
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Flush-ball seal385311658Seals the bottom of the bowl when the flush ball is closed.
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White floor mounting kit385311652Floor connection hardware and seal for the applicable white trim arrangement.
View this partChoosing a seat or diagnosing a leak
The 301 and standard 311 have round, polypropylene factory seat configurations; the 321 has a longer elongated-bowl and enameled-wood seat arrangement. Replacement seats, hinge hardware and optional seat styles must be matched to the installed assembly rather than selected only by colour.
If water drains out of the bowl between flushes, inspect the flush-ball seal. If the supply keeps running or leaks near the pedal, inspect the water valve and hose connections. A leak at the RV floor flange calls for checking the floor mounting seal instead. Turn off the water supply before servicing.
Original Dometic manuals
Dometic 300/301, 310/311 and 320/321 installation and dimensions (PDF) and Dometic sanitation replacement-parts drawings (PDF) contain the original technical references. The product photographs and comparison table above are visible without opening either PDF.
For taller toilets, compare the Dometic 300, 310 and 320 standard-height models and their related parts.
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